JIANG Tingting,LIU Yarong,SHI Xiaoyan,et al.Inhibitory Effect of Paeonol on Vascular Smooth Muscle Cell Senescence by Reducing SIRT6/PARP1-mediated DNA Damage[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(10):83-92.
JIANG Tingting,LIU Yarong,SHI Xiaoyan,et al.Inhibitory Effect of Paeonol on Vascular Smooth Muscle Cell Senescence by Reducing SIRT6/PARP1-mediated DNA Damage[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(10):83-92. DOI: 10.13422/j.cnki.syfjx.20230707.
Inhibitory Effect of Paeonol on Vascular Smooth Muscle Cell Senescence by Reducing SIRT6/PARP1-mediated DNA Damage
To investigate whether the effects of paeonol (Pae) on angiotensin Ⅱ (AngⅡ)-induced senescence in vascular smooth muscle cells (VSMCs) were related to angiotensinogen of silencing regulatory information factor 6 (SIRT6)/adenosine diphosphate ribose polymerase 1 (PARP1) signaling pathway in VSMCs.
Method
2
The model of VSMC-stress aging induced by AngⅡ (100 nmol·L
-1
) was established. The rats were divided into normal group, model group, low, medium, and high-concentration Pae groups (30, 60, 120 μmol·L
-1
). The positive rate of cell senescence was detected by SA-
β
-Gal staining, the ability of cell proliferation was detected by the cell counting kit-8 (CCK-8) method, the expression of SIRT6, PARP1, p16, p21, p53, proliferating cell nuclear antigen (PCNA), deoxyribonucleic acid (DNA)-damaged protein
γ
-H2AX was detected by Western blot, and VSMC proliferation was detected by EdU staining. The silenced VSMCs were prepared by siRNA-SIRT6 transfection, and the protein expressions of SIRT6, PARP1, p16, and
γ
-H2AX in VSMCs silenced by SIRT6 were observed.
Result
2
The results of SA-
β
-Gal staining showed that the senescence positive rate of SA-
β
-Gal staining in the model group was higher than that in the normal group (
P
<
0.01), and the positive rate of SA-
β
-Gal staining in the Pae group was significantly lower than that in the model group (
P
<
0.05,
P
<
0.01). The results of Western blot showed that as compared with the normal group, the expression of PCNA, SIRT6, and PARP1 in the model group was down-regulated, and the expression of aging-related proteins p16, p21, p53, and
γ
-H2AX was up-regulated in the model group (
P
<
0.05,
P
<
0.01). Compared with the model group, Pae promoted the protein expression of PCNA, SIRT6, and PARP1 and inhibited the protein expression of p16, p21, p53, and
γ
-H2AX in a dose-dependent manner (
P
<
0.05,
P
<
0.01). The results of EdU staining showed that the number of EdU positive cells in the model group was lower than that in the normal group (
P
<
0.01), and the number of EdU positive cells in Pae groups was significantly higher than that in the model group (
P
<
0.05,
P
<
0.01). After SIRT6 silencing, the effects of Pae on promoting SIRT6 and PARP1 and inhibiting P16 were reversed (
P
<
0.05,
P
<
0.01). In addition, the addition of SIRT6 inhibitor (IN-1) promoted the occurrence of cell senescence induced by AngⅡ (
P
<
0.05,
P
<
0.01).
Conclusion
2
Pae can effectively inhibit the aging of VSMCs, and its mechanism may be related to the regulation of SIRT6/PARP1 signal pathway.
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